13. LEPTODACTYLUS, 945 
width of the eye. Toes without dermal margins. The hind lim) 
being carried forwards along the body, the tibio- tarsal articulation 
reaches the posterior border of the orbit. Dorsal skin without 
glandular folds; an abdominal discoidal fold. Colour above dark 
brown, with a blackish pale-edged triangle between the eyes, with 
its apex directed posteriorly ; a dark light-edged spot below the 
front of-the orbit ; tympanum and a streak behind it blackish. 
Guanajuato, Mexico. 
13. Leptodactylus perlevis. 
Cystignathus perlevis, Cope, Proc. Amer. Philos, Soc, xviii, 1879, 
p. 269. 
Tongue a longitudinal oval, entire. Vomerine teeth in two short 
transverse series behind the choane. Snout a little projecting, with 
distinct canthus rostralis, the nostrils about one third the distance 
from its apex to the orbit; tympanum not quite two thirds the 
width of the eye. First finger a little longer than second ; foot 
slender ; plantar tubercles insignificant. The hind limb being carried 
forwards along the body, the tibio-tarsal articulation reaches in 
front of the eye. Skin exceedingly smooth and shining, without 
glandular folds; an abdominal discoidal fold. Dark ashy grey 
above; sides blackish above, speckled with white and blackish 
above ; an interorbital dark spot; upper lip marbled ; posterior face 
of femora dark, with light specks ; posterior limbs obscurely cross- 
banded. 
Tehuantepec. 
14. Leptodactylus albilabris. (Prarn XVI. fig. 4.) 
Cystignathus albilabris, Giinth, Ann. S Mag. N. H. (3) iv. p. 217; 
" Reinh. § Liitk. Vidensk. Meddel. 1862, p: 205. 
ealiginosus, Brocchi, Bull. Soe. Philom. (7) i. p. 180. 
labialis, Cope, Proc. Amer. Philos, Soc, xvii. p. 90, and xviii. 
. 269, 
Leptodactylus caliginosus, Broech?, Miss. Sc, Mex., Batr. p. 87, pl. 5 
feel ® 
—— labialis, Brocchi, 1. c, p. 20. 
albilabris, Bouleng. Bull. Soc. Zool. France, 1881, p. 35 
Tongue oval, slightly nicked behind. Vomerine teeth in two 
slightly curved series behind the choane. Snout subacuminate, 
with prominent upper lip, a little longer than the greatest orbital 
diameter; nostril a little nearer the tip of the snout than the eye; 
interorbital space not much narrower than the upper eyelid; tym- 
panum not quite two thirds the width of the eye. Fingers mode- 
rate, first longer than second ; toes moderate, not fringed ; subar- 
ticular tubercles well developed ; sole with regular series of small 
tubercles corresponding with the metatarsals ; two small metatarsal 
tubercles. - The hind limb being carried forwards along the body, 
the tibio-tarsal articulation reaches the eye, or not quite so far, 
